The Eidos upgrade, introduced via the v6.6 mainnet release, fundamentally changes how Sei manages on-chain data. Traditional Merkle trees, which require nodes to recalculate entire hash chains for every state change, are being replaced by FlatKV. This flat key-value storage system allows for single-write state updates, while LtHash—lattice hashing—maintains a running fingerprint of the state in constant time. This shift ensures that the database workload remains stable even as the network’s total data footprint expands.
Beyond storage logic, Sei is isolating EVM state into a dedicated database to prevent historical queries from interfering with live transaction processing. The transition also includes the implementation of LittDB, a specialized engine for blocks and receipts that has demonstrated write throughput exceeding one gigabyte per second in internal tests. These technical improvements are paired with a new pruning path that has already shown significant efficiency gains, reducing cleanup times from 18 minutes to roughly five minutes during operations.
To maintain network continuity, the migration is being executed while the blockchain remains online. Existing and new storage systems operate in parallel, with data moving in batches between blocks. According to the network, shadow nodes were utilized to stress-test the migration against mainnet traffic to ensure block times remained stable throughout the transition. Node operators have been provided with configuration guides and a rollback protocol, though Sei confirmed that end users and application developers face no service interruptions during the rollout.
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